CN204034566U - A kind of SCR denitration gas approach - Google Patents
A kind of SCR denitration gas approach Download PDFInfo
- Publication number
- CN204034566U CN204034566U CN201420431184.2U CN201420431184U CN204034566U CN 204034566 U CN204034566 U CN 204034566U CN 201420431184 U CN201420431184 U CN 201420431184U CN 204034566 U CN204034566 U CN 204034566U
- Authority
- CN
- China
- Prior art keywords
- reactor
- wedge structure
- gas approach
- scr denitration
- catalyst
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Abstract
The utility model discloses a kind of SCR denitration gas approach, comprise: gas approach, described gas approach is connected with wedge structure, described wedge structure is connected with reactor, and the position that described reactor is connected with wedge structure is provided with rectification layer, is provided with catalyst layer in described reactor, the deflector that flue gas stream can be evenly distributed on above catalyst is provided with in described gas approach, the angle of the level cross-sectionn of described wedge structure and reactor is α, wherein, and 10 °≤α≤17 °; The side that described wedge structure is connected with reactor is provided with vertical section.The beneficial effects of the utility model: it has the inclined angle alpha scope of design determining SCR denitration reactor inlet flue wedge structure, under ensureing each operating mode, flow field uniformity, construction costs cheapization above first floor catalyst in SCR denitration system reactor, have higher denitration efficiency advantage.
Description
Technical field
The utility model relates to a kind of SCR denitration gas approach.
Background technology
In coal-burning power plant's combustion process, produce a large amount of with NO and NO
2be main oxynitrides (NO
x), directly enter in air and can cause severe contamination.Along with country is to NO
xthe raising of discharge standard, how coal-burning power plant reduces NO
xdischarge progressively come into one's own.SCR technology (SCR) is current more ripe denitration technology, and this technology is in the reactor, in flue gas, spray into a certain amount of NH
3, after ammonia nitrogen mixing, through the wedge structure of reactor upper inlet flue, downwards after over commutation layer, first floor catalyst generation chemical reaction can be arrived, i.e. NO
xby NH under the effect of catalyst
3be reduced to N
2and H
2o.At up-to-date mark 100mg/m
3emission limit under, SCR denitration technology becomes the first-selection of the industry large-sized unit denitration projects such as domestic thermoelectricity, chemical industry, meets strict gradually environmental requirement.
The key of SCR denitration technology is the flue gas flow field distributing homogeneity above first floor catalyst, and flow field uniformity is higher, and denitration efficiency is larger.The design of denitration reactor inlet flue, the flue gas flow field in decision systems above first floor catalyst, rational flue system not only reduces construction cost, effectively ensures system reliability service, is related to catalyst life and economy of power plant benefit and device long life.
CFD (Computational Fluid Dynamics) is the numerical simulation to flowing under fundamental flowing equations (mass-conservation equation, momentum conservation equation, energy conservation equation) controls, by calculating the fundamental physical quantity that can obtain in flow field on each position, as speed, pressure, temperature, concentration etc., it is numerical simulation technology important in recent years, be widely used in denitrification apparatus design, the design for Benitration reactor flue, deflector and spraying system provides important technology support.
In engineering design, the wedge structure inclined angle alpha of denitrating system gas approach is set as empirical value, lacks certain technical support.α is less than normal can affect flue gas flow field above catalyst, and α is bigger than normal causes consumptive material many and cost is high, is not even enough to the high uniformity ensureing flow field above first floor catalyst.
In sum, in current SCR denitration system engineering design, the determination of the wedge structure inclined angle alpha of gas approach relies on experience, causes existing in engineering being difficult to realize the shortcomings such as even flow field maximizes, consumptive material is many, expense is high above first floor catalyst.Therefore, now utilize vertical section h above the α angle of CFD technical optimization wedge structure and rectification layer, contribute to engineering design, comparatively reasonably scope of design is provided, the economy avoiding the conventional design of dependence empirical value to bring, the defect of result, realize the technical support to engineering design.
Utility model content
The purpose of this utility model is exactly to solve the problem, a kind of SCR denitration gas approach is provided, it has the inclined angle alpha scope of design determining SCR denitration reactor inlet flue wedge structure, under ensureing each operating mode, flow field uniformity, construction costs cheapization above first floor catalyst in SCR denitration system reactor, have higher denitration efficiency advantage.
To achieve these goals, the utility model adopts following technical scheme:
A kind of SCR denitration gas approach, comprise: gas approach, described gas approach is connected with wedge structure, described wedge structure is connected with reactor, and the position that described reactor is connected with wedge structure is provided with rectification layer, is provided with catalyst layer in described reactor, the deflector that flue gas stream can be evenly distributed on above catalyst is provided with between described gas approach and wedge structure, the angle of the level cross-sectionn of described wedge structure and reactor is α, wherein, and 10 °≤α≤17 °; The side that described wedge structure is connected with reactor is provided with vertical section.
Height h≤the 50mm of described vertical section.
Described catalyst layer is cellular.
Described deflector is folding shape deflector, the horizontal segment 300 ~ 500mm of deflector.
Described rectification layer is the square grid of 100X100mm of steel matter Q345, and grid is highly vertically 300mm.
The utility model has following beneficial effect:
(1) by the optimization to SCR denitration system gas approach, determine the scope (10 °≤α≤17 °) of the inclined angle alpha of wedge structure, ensure that the uniformity in flow field above first floor catalyst, successfully realize the optimization of flow field and cost.
(2) wedge structure vertical section h≤50mm above rectification layer, has to utilize and improves flow field uniformity above first floor catalyst.
(3) in traditional design, α is defined as empirical value, cannot reach the design had most.α is bigger than normal or less than normal, can cause the shortcoming that cost is high or flow field uniformity is not high.
(4) the angle α after wedge structure optimization and vertically section h, ensure that required flow field uniformity is high, engineering construction minimization of cost, consider from the angle of flow field and engineering cost, in wedge structure during 10 °≤α≤17 °, design can reach optimal effectiveness.
(5) described deflector not only plays guide functions, and stationarity is good.
(6) described grid plays better uniform to air-flow, ensures voltage loss requirement simultaneously.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model;
Wherein, 1, gas approach, 2, deflector, 3, wedge structure, 4, rectification layer, 5, catalyst layer.
Detailed description of the invention
Below in conjunction with accompanying drawing and embodiment, the utility model is described in further detail.
As shown in Figure 1, a kind of SCR denitration gas approach, comprise: gas approach 1, described gas approach 1 is connected with wedge structure 3, described wedge structure 3 is connected with reactor, the position that described reactor is connected with wedge structure 3 is provided with rectification layer 4, catalyst layer 5 is provided with in described reactor, the deflector 2 that flue gas stream can be evenly distributed on above catalyst is provided with between described gas approach and wedge structure, described wedge structure 3 is α with the angle of the level cross-sectionn of reactor, wherein, 10 °≤α≤17 °; The height of the side that described wedge structure 3 is connected with gas approach is H, and the side that described wedge structure is connected with reactor is provided with vertical section.
Height h≤the 50mm of described vertical section.
Described catalyst layer is cellular.
Described deflector is folding shape deflector, the horizontal segment 300 ~ 500mm of deflector.
Described rectification layer is the square grid of 100X100mm of steel matter Q345, and grid is highly vertically 300mm.
The utility model utilizes fluid mechanics principle, and by CFD flow field simulation, wedge structure inclined angle alpha and vertical section h above adjustment reactor, make gas approach air-flow arrive above first floor catalyst and be evenly distributed.α is too small and cause above first floor catalyst less than normal near the gas flow rate of flue side, and α is excessive causes that consumptive material is high, construction cost increases, thus ensures that air-flow is evenly distributed in reactor, improves denitration efficiency; Vertical section h above rectification layer utilizes air-flow by below inclined angle alpha.
By reference to the accompanying drawings detailed description of the invention of the present utility model is described although above-mentioned; but the restriction not to the utility model protection domain; one of ordinary skill in the art should be understood that; on the basis of the technical solution of the utility model, those skilled in the art do not need to pay various amendment or distortion that creative work can make still within protection domain of the present utility model.
Claims (5)
1. a SCR denitration gas approach, it is characterized in that, comprise: gas approach, described gas approach is connected with wedge structure, and described wedge structure is connected with reactor, the position that described reactor is connected with wedge structure is provided with rectification layer, be provided with catalyst layer in described reactor, be provided with the deflector that flue gas stream can be evenly distributed on above catalyst between described gas approach and wedge structure, the angle of the level cross-sectionn of described wedge structure and reactor is α, wherein, 10 °≤α≤17 °; The side that described wedge structure is connected with reactor is provided with vertical section.
2. a kind of SCR denitration gas approach as claimed in claim 1, is characterized in that, the height h≤50mm of described vertical section.
3. a kind of SCR denitration gas approach as claimed in claim 1, is characterized in that, described catalyst layer is cellular.
4. a kind of SCR denitration gas approach as claimed in claim 1, is characterized in that, described deflector is folding shape deflector, the horizontal segment 300 ~ 500mm of deflector.
5. a kind of SCR denitration gas approach as claimed in claim 1, is characterized in that, described rectification layer is the square grid of 100X100mm of steel matter Q345, and grid is highly vertically 300mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420431184.2U CN204034566U (en) | 2014-07-31 | 2014-07-31 | A kind of SCR denitration gas approach |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420431184.2U CN204034566U (en) | 2014-07-31 | 2014-07-31 | A kind of SCR denitration gas approach |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204034566U true CN204034566U (en) | 2014-12-24 |
Family
ID=52235276
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420431184.2U Active CN204034566U (en) | 2014-07-31 | 2014-07-31 | A kind of SCR denitration gas approach |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204034566U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104587807A (en) * | 2015-01-22 | 2015-05-06 | 东方电气集团东方锅炉股份有限公司 | Flue type reactor |
| CN106731789A (en) * | 2016-12-05 | 2017-05-31 | 北京工业大学 | A kind of efficient SCR denitration reactor |
| CN109613170A (en) * | 2018-12-29 | 2019-04-12 | 浙江浙能兰溪发电有限责任公司 | A kind of denitrating catalyst performance monitoring device |
-
2014
- 2014-07-31 CN CN201420431184.2U patent/CN204034566U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104587807A (en) * | 2015-01-22 | 2015-05-06 | 东方电气集团东方锅炉股份有限公司 | Flue type reactor |
| CN106731789A (en) * | 2016-12-05 | 2017-05-31 | 北京工业大学 | A kind of efficient SCR denitration reactor |
| CN109613170A (en) * | 2018-12-29 | 2019-04-12 | 浙江浙能兰溪发电有限责任公司 | A kind of denitrating catalyst performance monitoring device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN202410505U (en) | Desulfurization, denitration and demercuration integral device | |
| CN202606007U (en) | Ammonia desulfurization and denitrification tower | |
| CN101844037A (en) | Tower for flue gas desulfurization in homogeneous air-humidifying method | |
| CN101987280A (en) | SCR (silicon controlled rectifier) denitration reactor of coal fuel gas | |
| CN204034566U (en) | A kind of SCR denitration gas approach | |
| CN203507792U (en) | Synchronous desulfurization and denitrification tower | |
| CN203577639U (en) | Swirl mixing device for SCR (selective catalytic reduction) flue gas denitrification system | |
| CN205288078U (en) | Flue gas thick liquid distributes again sprays desulfurization dust collector | |
| CN205586763U (en) | Square chest formula desulfurizing tower | |
| CN207042258U (en) | Selective catalytic reduction denitration device | |
| CN109647193A (en) | A kind of SCR denitration method and device of ammonia segmentation supply | |
| CN103566742A (en) | Device for removing high-concentration ammonia nitrogen in chemical waste gas | |
| CN103463961B (en) | Airflow uniform distribution type wet-method smoke desulfurization and absorption tower | |
| CN205598919U (en) | Desulfurizing tower with flue gas tray that flow equalizes | |
| CN202096879U (en) | Front secondary rectification static mixer of SCR (silicon controlled rectifier) denitration system | |
| CN201200864Y (en) | X-shaped static mixer of selective catalytic reduction and denitration system | |
| CN208115518U (en) | A kind of dual forked type reinforcing mixed flue gas denitrification apparatus | |
| CN205517206U (en) | High -efficient dust removal flow straightener of square chest formula desulfurizing tower | |
| CN207533025U (en) | Gas mixing flow-disturbing even distribution device and the denitrification apparatus for including it | |
| CN106731810A (en) | A kind of SCR denitration eddy flow chip static mixer | |
| CN204891596U (en) | Wet flue gas desulfurization tower entry flue gas equipartition device | |
| CN205252890U (en) | A increase device for desulfurizing tower | |
| CN205586801U (en) | High -efficient gas -liquid flow straightener of square chest formula desulfurizing tower | |
| CN202460472U (en) | Double-layer ammonia injection grid used in industrial flue gas selective catalytic reduction (SCR) denitration device and having zone adjustment function | |
| CN105498510A (en) | Synergy device used for desulfurizing tower |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |